Attachment for drill-chucks and drills.



M. SZEITL.

ATTACHMENT FOR DRILL CHUGKS 'AND DRILLS. APPLICATION FILED JULY 31, 1911 1,035,495. PatntedAug. 13,1912.

m 4 I w n 1 -51"- mi ifi iii li AT'IASEIMENT F03 DRILL-GEUQKS X33155 Applieation filed July 31,

Specificazien of Letters 3321mm To all wllom 2'75 ie/(23 i cont-em Be. it lcnnn'u t'nni- 1 151m Smurf; i Fsnl-iiee 0f the King of Hungary, anal resuleni ()3? Stamford. in he County of if' nirlielil and Staie of Cunuertieut have invented certain new and useful iinprm'emeuis in Attach inputs for Drill-Chunks and Drills, of whieh the following is specification.

. The present invention relates in improvechucks, and more pm-iuwilurly to liint class (if chucks n which the (li'illS or niher simi- Tuislx (hills and nthor ('uiliiu lnnls, such as runners and hips, have Ul'kll ily cyiin- \lru'ul shanks. The drill ('luu-l lzereiufore in use are provulml Willi jaws which grip lhe ('yliurlrirul slmnlw mi uzzii'l inols for the purpose renlurii'ig shut-ks, and imhnldi n against ruin-tum l' "l:\ll\' lo the bmliQS e rliueiis.

When such ilrills 01' other tuols are in use fur some lime, their shanks are by the jaws: of the chucks injurml in some extent, (i110 in the pressure which is exrriwl upon ihe sumo. Obviously such injured :lriiis ur Hii'ldi tools, when again inserted intu the chuck while kept from falling; nut imui ihe elm; jaws thereof, wiil net he gulf n sted Wii'li the ennui? cliine, rmiil have, the tive to the rims}: Lou an improper per-f One 0f the objevtu tion is to nrmiale u (ii'iil c '9 tachment, whereby the (llll u" niher similar tool 18 always positively rllir'fii'n *2 gews :iliuing gene, and

g out.

the chuck serving 011i 1e drill from fuiiin v obj-set of i the aiiuchment above form as he adapt it to sizes at drill shanks.

A further object of the invention is ie form the ordinary eylinrirical shanks of twist drills and oiner cuttingiools in such a manner so as to fit the attnelnnent, forming the subject matter of the present invention. I 7

With these and. other objects --.in View, which will mare fully appear as the nature of the in? n 5 "WI'LQQI' understood, the same consists in tin; con'ibination, arrangement and constructien of parts hereinafter fully described, pointed out in the-appended elaiin and illustrated in the acceinpanying tion in make tinned of such r ving number of in: 01 ci'jinsirurmon the spirit 0r SZLCliliL lageev (if the inveui 1011.

A few of he mun g of the inr i eonigmi'yil dim.

Future i lihrnugii a drill mimic pi tacluneni, and heir. accordance u-il'h a uimilu 7 type; Fig; Hiu'lilll 1 .06 as thus 5 Grill 01 other tool Wiil be centered and gripped by the firms 152. The jaws of the chuck hold. the drill, or other tool, by their gripping action, or in other Words by friction only.

The attachment forming the subject mutier of the preseni; invewcioncomprises a shank 24, the lower portion 25 of which is cylindrical, and fits into the bore 23 of the chuck, to be c nnected with the chuck body in any manne known in the art. The upper portion 26 of the shank 24 tapers toward its upper end, and fits the spindle of the drilling machine; In the lower face of the cylindrical port-ion 25 of the shank 24 is formed a, preferably, V'shaped recess 27, its perfectly flat walls converging toward the portion 26 of the shank. The recess 27 is engaged by the flattened upper end 28 of the shank 29 of a twist drill. The flattened end 28 of the drill is also V-shaped in cross section, its flat surfaces 29 and 30 being arranged under an angle of about 60 to each other. The flatwalls of the recess 27 are, .of course, also arranged under the same angle to each other.

The operation of the device is'as follows: I

Since the flattened end 28 of the drill 29 is in engagement with the walls of the recess 27 in the shank 24, a positive drive of the drill is obtained, the jaws of the chuck serving only to hold the drill in its central position and preventing it from falling out.

. aws.

Referring now more particularly to Figs. 2 to inclusive, it will be observed that the attachment is used upon a chuck adapted to accommodate larger sizes of drills. This chuck comprises a. body 31, provided with diametrical grooves 32, 32, in which the jaws 33 are moved toward and away from the longithdinal of the chuck. The aws are operated by screws Set, engaging a female screw 35, which is located partly in the jaws and partly in the chuck body. The jaws are provided with gripping teeth 36, 36, which are staggered with respect to each other upon the two jaws, al-

lowing thereby the latter to be brought in close relation to each other when drills or other tools of very small sizes are used. In the chuck body is provided a vertical centrally arranged cylindrical recess 37, into which fits a shank 24 of a construction described in connection with Fig. l of the drawings. The operation of'this chuck is similar to that shown in Fig. 1 of the drawings, the only diflierence being that the gripping jaws are operated in a different manner.

It should be observed that the attachment forming the subject matter of the present invention can be employed upon almost all known types of drilland lathe-chucks.

In Figs. 5 and 6 a reamer is shown, which is constructed in accordance with the present invention, its shank 38 being provided with a flattened upper end'39, its flat surfaces 40 and 41 being arranged under an angle corresponding to that between the walls of the recess 27 in the shank 24 of the attachment hereinbefore described;

It is to be noted that the shanks of-any other tools which are to be held by chucks either upon drilling machines or lathes can be provided with flattened upper ends in accordance with this invention.

What I claim is i In a device of the character. described, a drill chuck comprising a body portion having a centrally arranged vertical cylindrical bore, a plurality of jaws slidablyarranged thereon, means for shifting said jaws into contact with a shank whereby the latter is held against longitudinal movement upon said chuck, and a shank inserted in said bore having a substantially V-shaped recess in its lower face, substantially as and for the purpose specified.

Signed at Stamford, in the. county of Fairfield and State of Connecticut, this 27th day ofJuly, A. D. 19l1.

. 'MAX SZEITL.

lVitncsses l/Vm'rnnor' A. CLARK, ALonuNoN O. Qunmv, 

